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AM1860/1850 Standard Platinum Resistance Thermometer User’s Guide AM1860/1850 Standard Platinum Resistance Thermometer User’s Guide Table of Contents Before you start ---- Warnings & Cautions ........................................................................ 2 1 Introduction................................................................................................................. 3 1.1 Main Application ................................................................................................ 3 1.2 Main Features...................................................................................................... 3 1.3 Calibrations ......................................................................................................... 3 2 Specifications .............................................................................................................. 4 2.1 Specifications...................................................................................................... 4 3 General Operations .................................................................................................... 5 3.1 Connecting to the readout device........................................................................ 5 3.2 Drive Current ...................................................................................................... 5 3.3 Stability of Readings........................................................................................... 5 3.4 Immersion Requirements .................................................................................... 5 3.5 Thermal EMF...................................................................................................... 6 3.6 Over heating........................................................................................................ 6 4 Care and Handling Guidelines ................................................................................... 7 5 Troubleshooting .......................................................................................................... 8 5.1 Troubleshooting .................................................................................................. 8 5.2 Problem Causes and Solutions............................................................................ 8 6 Limited Warranty & Limitation of Liability................................................................ 9 1/10 AM1860/1850 Standard Platinum Resistance Thermometer User’s Guide Before you start ---- Warnings & Cautions Warnings: Follow these guidelines to avoid personal injury: 1. Only use this instrument in the manufacture specified temperature range. 2. The handle of this instrument can become hot when it is used to measure high temperatures for extended periods of time. 3. DO NOT submerge PRT handle when taking measurement. 4. DO NOT use this instrument to measure the temperature of any hazardous live component. 5. Follow all other safety guidelines listed in this user’s guide. Cautions: Follow these guidelines to avoid possible damage to the instrument: 1. Avoid mechanical shocks. DO NOT drop or slam the probe in any way. This will cause damage to the probe internally and affect its calibration and accuracy. 2. Read Section entitled “Care and Handling Guidelines” before removing the PRT from the shipping box. Incorrect handling can damage the PRT and void the warranty. 3. Keep the shipping container in case it is necessary to ship the PRT. Incorrect packaging of the PRT for shipment can cause irreparable damage. 4. Calibration Equipment should only be used by Trained Personnel. 2/10 AM1860/1850 Standard Platinum Resistance Thermometer User’s Guide 1 Introduction 1.1 Main Application AM1860/1850 Standard Platinum Resistance Thermometer (SPRT) is an interpolating instrument converting temperature to resistance. It works together with readout device to measure temperature or change of temperature. It has wide applications for dry-wells or temperature baths. 1.2 Main Features Extreme low drift rate Metal sheathed Great reference thermometer for dry block calibrator 1.3 Calibrations It is recommended to calibrate this SPRT annually over the full temperature range. In between annual calibrations, user can check the drift rate by comparing Rtpw against the last calibration results. Refer to specifications section for normal drift rate. 3/10 AM1860/1850 Standard Platinum Resistance Thermometer User’s Guide 2 Specifications 2.1 Specifications Temperature Range Rtpw Resistance Ratio Drift at 0.01°C* Repeatability Thermal Shock Self-heating Measurement Current Sensor Length Insulation Resistance Sheath Material Dimension External Leads Termination Handle Dimension Calibration 1850: -200°C to 500°C 1860: -200°C to 670°C Nominal 25 Ω or nominal 100 Ω W(Ga)>=1.11807 W(Hg)<=0.844235 1850 ΔR(0.01°C ) <0.002 °C/100 hours at 500°C ΔR(0.01°C ) <0.008 °C/year 1860 ΔR(0.01°C ) <0.003 °C/100 hours at 670°C ΔR(0.01°C ) <0.01 °C/year ±0.0015 °C ±0.0015 °C after 10 times thermal cycles from minimum to maximum temperatures 0.0015 °C at 1 mA current 1 mA 42 mm >1000 MΩ at room temperature InconelTM 1850: 6.35 mm (OD) X 480 mm (L) 1860: 6.35 mm (OD) X 500 mm (L) Insulated copper wire, 4 leads, 2.5 meters Gold-plated Spade 21mm (OD) X 80 mm (L) Not included 4/10 AM1860/1850 Standard Platinum Resistance Thermometer User’s Guide 3 General Operations 3.1 Connecting to the readout device The AM1860/1850 is equipped with a four-wire cable (see Figure 1). Four lead wires are used to cancel lead wire resistance. For best results, the readout device should be equipped to handle fourterminal resistors. The lead wires can be distinguished by insulation colors. Lead wire pairs attached to each end of the sensor are identified by red/black and white/blue insulation. White Red Yellow Blue Figure1 3.2 Drive Current AccuMac recommends 1mA as drive current to ensure the best measurement. 3.3 Stability of Readings To achieve the best accuracy, allow sufficient time for PRT to stabilize before taking the readings. 3.4 Immersion Requirements Stem effect can cause measurement errors due to heat lost or gained by the sensing element through the thermometer stem. To 5/10 AM1860/1850 Standard Platinum Resistance Thermometer User’s Guide minimize the error, appropriate immersion depths are required. A practical way to determine the minimum immersion depths is to change the depth gradually until the readings have significant changes after stabilization. Do not submerge PRT handle when taking measurement. 3.5 Thermal EMF Each AccuMac PRT has gone through an annealing process and stability test to minimize the thermal EMF, which is caused by either impurities of sensing element or temperature differentials at lead wires connection point. 3.6 Over Heating The sensing element this SPRT is sealed inside an Inconeltm sheath to ensure the best stability and repeatability. The seal can be breached if the SPRT is over heated for an extended period of time. 6/10 AM1860/1850 Standard Platinum Resistance Thermometer User’s Guide 4 Care and Handling Guidelines 1. DO NOT subject the SPRT to any physical shocks and vibrations. a. When not using the SPRT, keep it in a place that’s not prone to drop, slam, bang, vibration or other strong physical contacts. Use a protective box or a carrying case whenever possible. b. When shipping the SPRT, use protective box and other protective packaging materials to minimize mechanical shocks as much as possible. c. When using dry blocks, make sure the well diameter is appropriate to allow the SPRT move up and down smoothly. 2. DO NOT subject the SPRT to any contaminations. a. Keep the SPRT as clean as possible. Avoid contaminations as much as possible. 3. DO NOT over heat. a. Do not use SPRT above the manufacture specified temperature range. b. Do not expose the SPRT handle and lead wires to extreme temperatures. 7/10 AM1860/1850 Standard Platinum Resistance Thermometer User’s Guide 5 Troubleshooting 5.1 Troubleshooting If the SPRT functions abnormally, it could be caused by several possible problem conditions that are described in this section. Try the solutions recommended and if the problems are still not solved, contact manufacture for warranty or repair service. Be sure to have the model number and serial number of your SPRT available. 5.2 Problem Causes and Solutions a. R0/Rtpw becomes higher significantly. This is likely caused by mechanical shocks. The SPRT should be annealed to release the stress of platinum wires and to recover R0/Rtpw value. Measure R0/Rtpw of the SPRT after annealing to verify. b. R0/Rtpw unstable during the measurement. This is likely caused either by bad connections or sensor coils short. Check the connections first and if the connections are good, the SPRT may be damaged. 8/10 AM1860/1850 Standard Platinum Resistance Thermometer User’s Guide 6 Limited Warranty & Limitation of Liability Each product from AccuMac Corporation is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is 1 year for the Platinum Resistance Thermometer. The warranty period begins on the date of the shipment. Parts, product repairs, and services are warranted for 90 days. The warranty extends only to the original buyer or end-user customer of an AccuMac authorized reseller. The warranty will not extended to products that have been misused, altered, neglected, or damaged by accident or abnormal conditions of operation or handling. To obtain warranty service, contact AccuMac Corporation at: 1490 S Price Rd STE 211 C Chandler, AZ 85286 USA Tel: (480)634-0603 Email: [email protected] 9/10